Doll Up Stickers - Dress up your messages.
My Ninja Stickers Pack - Showcase your inner ninja!
GIPHY for iMessage - The easiest way to share all the GIFs in all your txts
Bitmoji - Turns your avatar into stickers and emoji
GIF Search on Twitter - Get ready to search and send GIFs in tweets and DM's
StickerPop API - Embed all the best stickers and GIFs into your apps.